Is Liam and Miley’s relationship in trouble? The engaged duo partied separately during Oscars weekend, and Liam left a party with January Jones on Feb. 23.

“It looked like [Liam and January] had some hot chemistry,” an eyewitness inside the pre-Oscars party tells Star magazine.

Liam was allegedly the perfect gentleman too!

“Liam got January’s coat and helped her put it on, then they headed outside. They made sure to leave a few seconds apart, so they wouldn’t attract too much attention. Then they jumped into a waiting car and took off,” the source adds.

Miley Cyrus Is Acting Single

While Liam partied at the Chateau Marmont on Feb. 23, Miley “was all over the place” at Elton John’s AIDS Foundation party on Feb. 24. A source says, “She certainly gave off the impression that she’s single. Someone even asked her how Liam was doing, and she said she doesn’t care how he’s doing!”

Miley also alarmed onlookers in mid-February while at New York Fashion Week. “She was flirting with every guy and girl in sight, especially the models,” an insider tells Star.